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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 59 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0505: IDLE CONTROL SYSTEMDIAGNOSTIC AIDS
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Aids

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

With engine idling at normal operating temperature and all accessories OFF, monitor the following parameters on scan tool for correct operation:

  • IAC Motor Command - 25-45 percent.
  • Electrical load - No.
  • Commanded A/C - OFF.

Scan tool can be used to isolate the cause of an intermittent DTC P0505. Engine idle speed can be controlled sing the scan tool. Operate IAC valve using scan tool while checking for a smooth increase and decrease in engine speed. If engine speed can be controlled, IAC system is functioning normally. Check for the following conditions:

  • Any blockage of air intake system.
  • Any blockage of IAC passage.
  • Excessive deposits on throttle plate or throttle bore.
  • Any large vacuum leaks.

An intermittent malfunction may be caused by a fault in IAC sensor electrical circuit. Check wiring harness and related components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article. Repair any electrical circuit faults found. Information included in freeze frame data can be useful in determining vehicle operating conditions when DTC first set. If DTC P0505 does not reset, but a driveability symptom still exists, diagnose by symptom. See TROUBLE SHOOTING - NO CODES - 1.8L VIBE article.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.